74HC595 IC 

• 8-bit, Serial In – Parallel out Shift register
• Operating Voltage: 2V to 6V
• Power Consumption: 80uA
• Output source/sink current: 35mA
• Output Voltage is equal to Operating voltage
• Minimum high-level Input Voltage: 3.15V @(Vcc=4.5V)
• Maximum low-level Input Voltage: 1.35V @(Vcc=4.5V)
• Can be easily cascaded with more IC to get more outputs
• Maximum Clock Frequency: 25Mhz @4.5V